Wheel torque figures 17 vs 15
#3
09-24-2006, 02:54 PM
RE: Wheel torque figures 17 vs 15
oh right ok well here's what was said (not by me!!)
"been crunching some numbers... want to really demonstrate the difference wheel size makes.
Lets take a sol, and put some rota sub zeros on it... this is a light weight wheel, and pretty common.
So lets compare the difference between some 15's and some 17's, assuming common widths and common tire sizes.
Assuming an edge weighted model(most accurate approximation) is used, the 17's suck up an extra 26 ft lbs of torque. That's A LOT for a honda that doesn't make much power. The 17's also add an equivalent 126 kg of weight on the chasis.
Think of the amount of money a lot of people would spend to make an extra 26 ft lbs of torque or the amount of effort people make to strip off that much extra weight?
Now, lets pretend that some how we get a 17" wheel that's the exact same weight of the 15" and the tire is the exact same weight. Something not really possible, but for theoretical sake.
The equivalent weight difference on the chasis is 56kg using the edge weighted model.
What about 16"?
18 ft lbs of torque and 86kg on the chasis
will obviously vary depending on each specific tire used, which wheel design, etc
http://www.mazda6tech.com/files/rotational.xls
the ft lbs issue really directly connects to acceleration... that's what it's basically figuring out.
but yes, if it's making this big of a difference to acceleration, I'm sure you can imagine what it does for handling/braking/economy, etc "
Well.....true or not?? what you guys think??
_________________
"been crunching some numbers... want to really demonstrate the difference wheel size makes.
Lets take a sol, and put some rota sub zeros on it... this is a light weight wheel, and pretty common.
So lets compare the difference between some 15's and some 17's, assuming common widths and common tire sizes.
Assuming an edge weighted model(most accurate approximation) is used, the 17's suck up an extra 26 ft lbs of torque. That's A LOT for a honda that doesn't make much power. The 17's also add an equivalent 126 kg of weight on the chasis.
Think of the amount of money a lot of people would spend to make an extra 26 ft lbs of torque or the amount of effort people make to strip off that much extra weight?
Now, lets pretend that some how we get a 17" wheel that's the exact same weight of the 15" and the tire is the exact same weight. Something not really possible, but for theoretical sake.
The equivalent weight difference on the chasis is 56kg using the edge weighted model.
What about 16"?
18 ft lbs of torque and 86kg on the chasis
will obviously vary depending on each specific tire used, which wheel design, etc
http://www.mazda6tech.com/files/rotational.xls
the ft lbs issue really directly connects to acceleration... that's what it's basically figuring out.
but yes, if it's making this big of a difference to acceleration, I'm sure you can imagine what it does for handling/braking/economy, etc "
Well.....true or not?? what you guys think??
_________________
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